Even though most GTO Judges were equipped with either the optional 4-speed manual or 3-speed automatic transmission, the 3-speed manual was the standard transmission. Not only was this the case with most years of the GTO but also with many other muscle cars during this era.
To understand the history of the floor-mounted 3-speed, one has to go back to the first mass produced car — the Ford Model T.
It was a primitive car but it had a third foot pedal the clutch pedal and a floor-mounted manual transmission shifter.
The Model T was the vehicle that introduced the masses to the driving motion of the left foot pressing a clutch pedal in conjunction with the right hand shifting the transmission via a floor-mounted shifter. As cars and work trucks progressed from the Model T the floor-mounted transmission shifter became the industry standard. By the s the manual shifter moved from the floor to the steering column.
And by the s when automatic transmissions became popular, the automatic transmission gear shifter was also found on the steering column. With the advent of the new emerging youth market in the s some base level cars became equipped with a standard 3-speed manual floor-mounted shifter. Pontiac tweaked the package with some other performance enhancements and voila — the introduction of the world to the GTO.
The bare-bones Tempest based GTO was standard with a 3-speed manual floor-mounted transmission. Every other American automaker followed suit and used a base-level mid-sized or compact car with a standard 3-speed floor-mounted manual transmission shifter as the basis for its muscle car offerings. These automakers would also offer as optional equipment on these cars, a floor-mounted 4-speed manual shifter.
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The bell housing. It has a removable tube that the throwout bearing rides on. The main bearing in this unit is comprised of caged needles in shell races. Loose needles and flat thrust bearings are used throughout the transmission. Casting number is Limited parts availability. Parts List 54 Aluminum case, end-loaded unit with an integral bell housing. Isuzu logo is cast into the drivers side of the case. This is found only is GM diesel applications and has a different starter position than the unit that goes into the Isuzu vehicles.
Aluminum case with top cover, internal single-rail shift with the shifter mounted on the extension housing. Casting numbers on the case, cover or extension housing are or The cluster gear is supported on both ends by cylindrical roller bearings. The number on the front cluster gear is DK All five synchro rings are brass. Similar physical appearance and is best to remove the top cover in order to distinguish between the two.
If you are unable, you can check the number of the front cluster bearing. The number on the front cluster gear bearing is BCE. These similar transmissions have three different designs and designations. Teardown is necessary before ordering rebuild kit as the differences between them are integral. It is a fully synchronized Overdrive transmission including reverse. It may be identified by a tag attached to the P.
The four main supporting bearings in this unit are tapered. Positractions 4 Different types of differentials, whats the difference? What rear end ratio do I have in my Ford is it posi! Need help finding the right parts for your vehicle? Get a Quick Quote. Cast iron case and extension housing with 4-bolt side cover. Cast iron case and extension housing with 7-bolt side cover. Cast iron case and extension housing with 9-bolt side cover.
Cast iron, top-loaded case with side shift linkage. Cases, extension housings and side covers may be cast iron or aluminum and in any combination thereof.
Aluminum case, extension housing and side cover. Cast iron case, extension housing and side cover. Cast iron case with a flat pan on the bottom and shifter linkage that has one arm on each side of the trans. Aluminum case, bell housing and extension housing. All aluminum top-loaded transmission with the shifter on the top of the extension housing with an internal single-rail shift linkage.
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